Highlighter Marking

In writing we are working on information reports and persuasive arguments. After we finish writing we have to highlight what we think is our best sentence in green, yellow or orange.Then the next day we get our books back and it has been marked the exact same way by Mister A, and he also highlights some parts in pink,they are the mistakes that we have made.We have to fix these mistakes.
There are three sections of writing in persuasive writing, there is the statement of position, series of arguments and the concluding statement.
In information reports there is the introduction,your bits of information and the conclusion.